A nucleotide sequence of human MD-1 and alignment of its amino acid sequence with mouse and chicken MD-1. (A) The nucleotide sequence of human MD-1 is shown. A poly(A) signal is underlined. An encoded amino acid sequence is also shown. A signal sequence and two canonical N-glycosylation sites are underlined. (B) Amino acid alignment of human, mouse, and chicken MD-1. Identical residues in mouse and chicken MD-1 are denoted by (−). Five gaps are introduced in chicken to optimize alignment and denoted by blanks.